Support CommandPlugin

Package.swift

@@ -33,6 +33,14 @@ let package = Package(
       name: "SwiftFormatConfiguration",
       targets: ["SwiftFormatConfiguration"]
     ),
+    .plugin(
+      name: "FormatPlugin",
+      targets: ["Format Source Code"]
+    ),
+    .plugin(
+      name: "LintPlugin",
+      targets: ["Lint Source Code"]
+    ),
   ],
   dependencies: [
     // See the "Dependencies" section below.
@@ -91,7 +99,32 @@ let package = Package(
         .product(name: "SwiftSyntax", package: "swift-syntax"),
       ]
     ),
-
+    .plugin(
+      name: "Format Source Code",
+      capability: .command(
+        intent: .sourceCodeFormatting(),
+        permissions: [
+          .writeToPackageDirectory(reason: "This command formats the Swift source files")
+        ]
+      ),
+      dependencies: [
+        .target(name: "swift-format")
+      ],
+      path: "Plugins/FormatPlugin"
+    ),
+    .plugin(
+      name: "Lint Source Code",
+      capability: .command(
+        intent: .custom(
+          verb: "lint-source-code",
+          description: "Lint source code for a specified target."
+        )
+      ),
+      dependencies: [
+        .target(name: "swift-format")
+      ],
+      path: "Plugins/LintPlugin"
+    ),
     .executableTarget(
       name: "generate-pipeline",
       dependencies: [

Plugins/FormatPlugin/plugin.swift

@@ -0,0 +1,72 @@
+import PackagePlugin
+import Foundation
+
+@main
+struct FormatPlugin {
+  func format(tool: PluginContext.Tool, targetDirectories: [String], configurationFilePath: String?) throws {
+    let swiftFormatExec = URL(fileURLWithPath: tool.path.string)
+
+    var arguments: [String] = ["format"]
+
+    arguments.append(contentsOf: targetDirectories)
+
+    arguments.append(contentsOf: ["--recursive", "--parallel", "--in-place"])
+
+    if let configurationFilePath = configurationFilePath {
+      arguments.append(contentsOf: ["--configuration", configurationFilePath])
+    }
+
+    let process = try Process.run(swiftFormatExec, arguments: arguments)
+    process.waitUntilExit()
+
+    if process.terminationReason == .exit && process.terminationStatus == 0 {
+      print("Formatted the source code.")
+    }
+    else {
+      let problem = "\(process.terminationReason):\(process.terminationStatus)"
+      Diagnostics.error("swift-format invocation failed: \(problem)")
+    }
+  }
+}
+
+extension FormatPlugin: CommandPlugin {
+  func performCommand(
+    context: PluginContext,
+    arguments: [String]
+  ) async throws {
+    let swiftFormatTool = try context.tool(named: "swift-format")
+
+    var argExtractor = ArgumentExtractor(arguments)
+    let targetNames = argExtractor.extractOption(named: "target")
+    let targetsToFormat = try context.package.targets(named: targetNames)
+
+    let configurationFilePath = argExtractor.extractOption(named: "configuration").first
+
+    let sourceCodeTargets = targetsToFormat.compactMap{ $0 as? SourceModuleTarget }
+
+    try format(
+      tool: swiftFormatTool,
+      targetDirectories: sourceCodeTargets.map(\.directory.string),
+      configurationFilePath: configurationFilePath
+    )
+  }
+}
+
+#if canImport(XcodeProjectPlugin)
+import XcodeProjectPlugin
+
+extension FormatPlugin: XcodeCommandPlugin {
+  func performCommand(context: XcodeProjectPlugin.XcodePluginContext, arguments: [String]) throws {
+    let swiftFormatTool = try context.tool(named: "swift-format")
+
+    var argExtractor = ArgumentExtractor(arguments)
+    let configurationFilePath = argExtractor.extractOption(named: "configuration").first
+
+    try format(
+      tool: swiftFormatTool,
+      targetDirectories: [context.xcodeProject.directory.string],
+      configurationFilePath: configurationFilePath
+    )
+  }
+}
+#endif

Plugins/LintPlugin/plugin.swift

@@ -0,0 +1,72 @@
+import PackagePlugin
+import Foundation
+
+@main
+struct LintPlugin {
+  func lint(tool: PluginContext.Tool, targetDirectories: [String], configurationFilePath: String?) throws {
+    let swiftFormatExec = URL(fileURLWithPath: tool.path.string)
+
+    var arguments: [String] = ["lint"]
+
+    arguments.append(contentsOf: targetDirectories)
+
+    arguments.append(contentsOf: ["--recursive", "--parallel", "--strict"])
+
+    if let configurationFilePath = configurationFilePath {
+      arguments.append(contentsOf: ["--configuration", configurationFilePath])
+    }
+
+    let process = try Process.run(swiftFormatExec, arguments: arguments)
+    process.waitUntilExit()
+
+    if process.terminationReason == .exit && process.terminationStatus == 0 {
+      print("Lintted the source code.")
+    }
+    else {
+      let problem = "\(process.terminationReason):\(process.terminationStatus)"
+      Diagnostics.error("swift-format invocation failed: \(problem)")
+    }
+  }
+}
+
+extension LintPlugin: CommandPlugin {
+  func performCommand(
+    context: PluginContext,
+    arguments: [String]
+  ) async throws {
+    let swiftFormatTool = try context.tool(named: "swift-format")
+
+    // Extract the arguments that specify what targets to format.
+    var argExtractor = ArgumentExtractor(arguments)
+    let targetNames = argExtractor.extractOption(named: "target")
+    let targetsToFormat = try context.package.targets(named: targetNames)
+
+    let configurationFilePath = argExtractor.extractOption(named: "configuration").first
+
+    let sourceCodeTargets = targetsToFormat.compactMap { $0 as? SourceModuleTarget }
+
+    try lint(
+      tool: swiftFormatTool,
+      targetDirectories: sourceCodeTargets.map(\.directory.string),
+      configurationFilePath: configurationFilePath
+    )
+  }
+}
+
+#if canImport(XcodeProjectPlugin)
+import XcodeProjectPlugin
+
+extension LintPlugin: XcodeCommandPlugin {
+  func performCommand(context: XcodeProjectPlugin.XcodePluginContext, arguments: [String]) throws {
+    let swiftFormatTool = try context.tool(named: "swift-format")
+    var argExtractor = ArgumentExtractor(arguments)
+    let configurationFilePath = argExtractor.extractOption(named: "configuration").first
+
+    try lint(
+      tool: swiftFormatTool,
+      targetDirectories: [context.xcodeProject.directory.string],
+      configurationFilePath: configurationFilePath
+    )
+  }
+}
+#endif